Add "Convert Markdown to ..." command

[pbodnar]

Hi, I was looking for a way of how to convert my "nicely formatted" Markdown-like notes to "not so nice" Jira markup comments. And this new command that I would like to share is the result.

It uses the mistletoe project that according to my research was the only one that contained at least a basically working Markdown-to-Jira converter. I only had to fix it a little bit to be really working (see PR #100). I see there is an alternative project called mistune that seems to be pretty similar while also more maintained, but I didn't have time to write a converter for it from scratch.

So the installation instructions (see README.md) are little bit more complicated than I would like, but hopefully still within "limits". Can you please check and let me know if it works for you?

[hluk]

Ah, yes, the infamous Jira formatting -- very annoying. I just leave my Jira comments in markdown and don't bother fixing them anymore. :)

[pbodnar]

Ah, yes, the infamous Jira formatting -- very annoying. I just leave my Jira comments in markdown and don't bother fixing them anymore. :)

Yeah, sometimes it's easier to copy the notes to Jira just as unformatted text. :)

But I was also thinking about a future possibility to convert to a Wiki syntax, provided that our company won't decide to use Markdown syntax instead, but I don't expect that in the nearest future... ;)

[hluk]

Thanks. I hope your fix in mistletoe gets merged soon.

[pbodnar]

Thank you!

[pbodnar]

For anyone interested, I made another two fixes within the mistletoe's fix-jira-renderer branch, so that:

• Table headers get rendered correctly for Jira.
• Conversion doesn't fail when there are some more 'exotic' letters like Czech 'ň' in the text to be converted.